Mourinho had to be escorted off the pitch Wednesday (NZT Thursday) after celebrating his side's 2-1 comeback win over the Italian side in the Champions League by cupping his hand to his ear to the crowd after the final whistle.
Young took the free-kick from the left where there was a scrum of desperate Juventus players trying to keep it out.
Pogba was one of United's poorest performers in their 2-1 win over Juventus on Wednesday evening, but Wenger believes the France global has the capability to prove his doubters wrong.
"I came here to do my job and I was insulted for 90 minutes, " Mourinho said.
Mourinho is unpopular among Juventus fans after managing bitter rival Inter Milan for three years.
It still is perhaps just a matter of time before they do secure a knockout spot but given how the game unfolded in the first 25 minutes of the second half, United shouldn't have been on the property, let alone have a gander at the backdoor.
There was an early onslaught from Juventus, as Leonardo Bonucci found Paulo Dybala on the edge of the area with a dinked ball, and the Argentine then lofted it to Cristiano Ronaldo, but his shot was blocked by Victor Lindelof.
It was Juventus' first defeat in any competition this season.
After the match, Mata said he was proud of his team's fight following what turned out to be a vital win for Manchester United. "But the others [Juventus fans] didn't forget".
Like most foes who go to Juventus, United had been outplayed, but they still played well enough to stay in the game as Rodrigo Betancur, a 21-year-old midfielder who cost only €9 million (Dh37.75m), impressed as much as he had at Old Trafford.
Juve remain in control of Group H on nine points, sitting ahead of United (seven), Valencia (five) and Young Boys (one).
I thought Juve were very unfortunate to lose after looking great in possession and unsafe around the box, but as soon as Juan Mata stepped up to take that free-kick I had a feeling it was going in.
"Now we've got to lift our heads, as we played really well and are still top of the group". "It's OK to lose against United, but seeing how the match went it leaves us with a bit of a bitter taste". "This is something more I wanted to hear them make comments again or not".
There is something rather uncomfortable about the club with the biggest wage bill in the Premier League being characterised as the underdog but, in the context of a week when plenty have been predicting misery for Manchester United, it was possible to see where Paul Pogba was coming from.
The Spaniard joined the fray in the 79th minute of Wednesday's Champions League match with his side down a goal following a spectacular Cristiano Ronaldo strike.
Allegri raised his eyebrows and gave a smile of appreciation at the goal.